method of base class return pointer to derived class?

[CryptKeeper]

I have a base class (let's say "Base") with a method returning a pointer to this class (let's say "Base *Base::Method (void)"). Then I also have a class derived from Base (let's call it "Derived").

How can I make Method() return Derived* instead of Base*? It's not automatically converted since I get a compilation error of the form "error: invalid conversion from `Base*` to `Derived*`.

The code would look like this:

class Base {
  ...
  public:
    Base *Method (void);
  ...
};
class Derived : public Base {
  ...
};
int main () {
  ...
  Derived example;
  Derived *tmp = example.Method(); // THIS DOESN'T WORK!!!

  return 0;
}

[ne555]

class Derived: public Base{
public:
  Derived* method();
}